September Weather in Colstrip, United States

Last updated: June 24, 2025

In Colstrip, United States, the average temperature in September hovers around 17°C (63°F), with a wide range where minimums can dip to 2°C (36°F) and maximums soar to 38°C (100°F). Expect about 54 mm (2.1 in) of precipitation spread over 6 days, while the average humidity levels remain high at 79%. Prepare for a mix of weather, making it essential to pack accordingly!

September Temperature in Colstrip

In September in Colstrip, the average temperature is 17°C (63°F). Maximum temperatures can reach 38°C (100°F), while minimums can drop to as low as 2°C (36°F). This makes Colstrip a great destination for travelers seeking a diverse climate, so be sure to pack accordingly!

September Weather in Colstrip: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Colstrip, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Colstrip, September typically has an average temperature of 17°C (63°F), with highs reaching up to 38°C (100°F) and lows dropping to around 2°C (36°F).

Data source: Temperature data for Colstrip generated using information from the Copernicus Climate Change Service.

September Precipitation in Colstrip

In Colstrip in September, the total precipitation amount is 54 mm (2.1 in) over the course of 6 days.

September Precipitation Trends in Colstrip

The chart displays monthly precipitation patterns in Colstrip, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Colstrip, September typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 6 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Colstrip

In Colstrip in September, humidity is 79%. With an average temperature of 17°C (63°F), this humidity feels like a warm, muggy embrace, making outdoor activities less comfortable and prompting travelers to seek shaded areas or cool refreshments more frequently.

September Average Humidity in Colstrip

This chart illustrates the average monthly humidity levels in Colstrip, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Colstrip is approximately 79%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Colstrip

In Colstrip in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Colstrip.

Maximum UV Index Levels in Colstrip for September

The chart shows the monthly maximum UV Index (UVI) for Colstrip in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Colstrip typically reaches 8, which falls under the very high exposure category.

Data source: Colstrip September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Colstrip Compares to Other Months

Weather in Colstrip varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Colstrip, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Colstrip, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	16 mm (0.6 inches)	78%	low
February Weather	-7°C (19°F)	36 mm (1.4 inches)	79%	moderate
March Weather	1°C (35°F)	31 mm (1.2 inches)	71%	moderate
April Weather	6°C (44°F)	57 mm (2.2 inches)	70%	very high
May Weather	13°C (56°F)	59 mm (2.3 inches)	75%	very high
June Weather	20°C (69°F)	53 mm (2.1 inches)	82%	very high
July Weather	24°C (76°F)	32 mm (1.3 inches)	84%	very high
August Weather	23°C (73°F)	26 mm (1.0 inches)	85%	very high
September Weather	17°C (63°F)	54 mm (2.1 inches)	79%	very high
October Weather	8°C (46°F)	41 mm (1.6 inches)	75%	moderate
November Weather	2°C (37°F)	22 mm (0.9 inches)	75%	moderate
December Weather	-2°C (29°F)	25 mm (1.0 inches)	81%	low